Personal computer full set

Personal computer with monitor 20~25 inches. The set includes keyboard and mouse, as well as 5.1 sound system, buffer and five home theater speakers. Two hard drives, total about terabyte, four memory modules. I don't remember how many gigabytes of memory, somewhere around 16 gigabytes. The problem with the computer is that you need to reinstall Windows, now it turns on from time to time due to errors. The computer is excellent, if you reinstall Windows, it will work well, excellent monitor, lik